204551100 has 108 divisors (see below), whose sum is σ = 690513096. Its totient is φ = 50348160.

The previous prime is 204551069. The next prime is 204551101. The reversal of 204551100 is 1155402.

204551100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×204551100² = 83682305022420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204551101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2959 + ... + 20441.

Almost surely, 2^204551100 is an apocalyptic number.

204551100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204551100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345256548).

204551100 is an abundant number, since it is smaller than the sum of its proper divisors (485961996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204551100 is a wasteful number, since it uses less digits than its factorization.

204551100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17516 (or 17506 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 204551100 is about 14302.1362040780. The cubic root of 204551100 is about 589.2061525014.

The spelling of 204551100 in words is "two hundred four million, five hundred fifty-one thousand, one hundred".